Adjustable drain air-vent box



(N0 Modl.) 2 Sheets-Sheet}.

' 'W. S. &-, E. B. CLARK.

ADJUSTABLE DRAIN AIR YENT BOX. 7 No. 549.627. Patented Nov. 12,1895. 4

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W. S; a 3,12. CLARK. ADJ USTABLB DRAIN AIR VENT BOX.

No. 549,627. Patented Nov.- 12, 1895;

AN DREW B.GRAHAMPHUTOMTNQWASHINEIDN .D C.

UN TED STATES? PATENT GEEICE.

WVILLIAM S. CLARK AND EDWARD B. CLARK, OF PHILADELPHIA,

PENNSYLVANIA.

ADJUSTABLE DRAIN AlR-VENT BOX.

SPECIFICATION formingpart of Letters Patent No. 549,627, dated November12, 1895.

Application filed June 22, 1894. Serial No. 515,435. (No model.)

ments in drain-inlets, and has for its obj ect' to so construct andarrange the inlet-box that 7 it may be adjustablysecured to theconducting-pipe and be readily adjusted to bring its upper face flushwith the surface to be drained.

A further object of our invention is to prevent the entrance of sticksor wire-or similar articles to the trap, and so avoid the clogging ofthe same. Y

In the accompanying drawings, Figure 1 is a sectional elevation on theline 1 1, Fig. 2, of a drain-inlet box constructed in accordance withour invention. Fig. 2 is a plan view of the same, partly in section, onthe line 2 2, Fig. 1; and Fig. 3 is a view similar to Fig. 1,illustrating a modification of our invention.

Referring to the drawings, A represents the upper portion of thedrain-pipe which leads .from the inlet-box B to the sewer or other neckb are preferably circular in form. At

the lower end'of the neck is preferably placed a strengthening-ringC,through which and the neck proper exte'ndsa number of set-screws c,the inner ends of which impinge upon the periphery ofthe drain-pipe A.

The drain -pipes usually extend in a vertical or nearly vertical linefrom an underground main drain for a distance of some five feet or moreand are connected to the main drain by a trap of ordinary construction.The upper end of the drain-pipe is brought up nearly level with thesurface, and when an inlet-box of the ordinary construction is to beattached it is usually necessary to cutv away more or less of the upperend of the pipe to make the connection, and if the pavement settles anythe box must be disconnected and the pipe again out to lower theinlet-box to the level of the pavement. By attaching the box to thedrain-pipe, in accordance with our invention, these difficulties areobviated, the drain-pipe need not be cut or finished, and the box may beraised or lowered in the pipe by merely loosening the set-screws andadjusting it to the required position.

A further difficulty which we have found with inlet-boxes is that anysticks, wire, or similar articles which may pass through the topopenings fall immediately to the connecting-trap and form obstructions,which soon cause the trap to fill up, making necessary the removal ofthe entire drain-pipe. To prevent the entrance of articles which cannotpass through the trap, we provide a circular conical shield D, situatedwithin the main body of the inlet-box immediately below the openings ofthe grating, and 'so arranged that any long article, as a stick or iron,will be prevented from passing below the shield, and if a shorterarticle does pass it will be caught by an annular gutter 19 formedwithin the box at the upper end of the neck 5 The shield is providedwith a series of annular ribs or knobs cl, which will engage the inserted end of any stick or wire and prevent its passage over the edge ofthe shield, while in order to facilitate the escape of air we mayprovide a series of openings d through the shield, as shown in Fig.- 3,the openings being arranged in a horizontal line to prevent the passageof solid material. The shield is supportedin any suitable manner withinthe box, preferably by attaching it at its apex to a rod or tube 6,depending centrally from the upper grating; or, as shown in Fig. 3, theshield mayhave aseries of supporting-legs e, adapted to rest on thegutter or rim 19 In this case the shield has preferably a vertical barextending from its apex to the grating to hold 5 it in place and to forma convenient handle for its removal. The shield might also be Havingthus described our invention, what we claim as new, and desire to secureby Letters Patent, is-

1. The combination of the drain pipe, an inlet box B having a main bodyportion Z) of greater diameter than the drain pipe and a lower neckportion 11 adapted to fit over and be secured to the drain pipe, anannular gutter b and a conical shield within the inlet box substantiallyas specified.

2. The combination of the drain pipe, an inlet box 13 having a main bodyportion 1) of greater diameter than the drain pipe and a neck portion 11adapted to fit over the upper

